import java.util.*;
public class Example3_9 {
   public static void main (String args[]) {
      Scanner reader = new Scanner(System.in);
      double sum = 0;
      int m = 0;
      while(reader.hasNextDouble()){
          double x = reader.nextDouble();
          m = m+1;
          sum = sum+x; 
      }
      System.out.printf("%d个数的和为%f\n",m,sum);
      System.out.printf("%d个数的平均值是%f\n",m,sum/m);
   }
}
